Also remember that the article is talking about the Pontiac 230 OHC engine which is not the same engine or block as the Chevy 250 engine or block you mentioned in the beginning post. The Pontiac engine block is an entirely different casting altogether, and could be much thicker than the Chevy block which is normally thin once bored past .060 over. So your comparing and taliking about 2 completely different engines.
